Liquid pump



April 21, 1953 R. E. GoRDxNlER 2,635,553

LIQUID PUMP Filed July 1e, 1947 .33;l IOL/ 35 15 l? 30% e? e5 13 l 16 12 AAAAAAAAA 16 Patented Apr. 2l, 1953 uNi'rED STATES ATENT OFFICE LIQUID PUMP Application July 18, 1947, Serial No. 761,805

2 Claims.

The present inventionl relates'to improvements in liquid pumping apparatus, and more particularly to pumps of the type Which employ impellers arranged to gyrate within a pumping compartment, deriving their suctionk and discharge characteristics by the rotary displacement by the impellers in the compartment.

Ina co-pending application for Letters Patent, Serial No. 751,595, filed May 31, 1947 now Patent No. 2,584,865, dated February 5, 1952, I describe an improved gyratory impeller pump, the impellers having integral projecting portions which are arranged to reciprocate in a slorl above the pumping compartment for the purpose of guiding the impellers against turning 4and also to form a barrier against the passage of fluid between the suction and discharge ports. This same style of pump may also be constructed with two-piece impellers, one element, considered as the main impeller element, is substantially cylindrical and which produces the pumping action, and the other being accessory thereto serving as the guiding and separating element.

A particular advantage of a gyratory impeller pump lies in its application for pumping uids with suspended solid material. The impellers are usually constructed, at least in part, of a resilient and healable material; and a combined rolling and sliding action of the impeller surface against the interior of the pumping compartment tends to carry any suspended solids through the pump without damage to the pump parts.

It is the principal object of the present invention to provide a pump of this class, using the two-piece impeller construction and having anl "improved arrangement of parts for guiding and controlling the impellers. A further aim of the invention is to provide a gyratory impeller for lsuch a pump having an improved port separater combined with and cooperating with an 'improved resilient non-metallic pumping or pressure producing structure. A still further object oi the invention is to provide a gyratory impeller pump which has an efiicient cycle of operation and which may be readily constructed with the usual machine tools employed in pump manufacturing procedures.

To these ends, in the pump of my present invention, I provide, in part, a dual impeller pump having a compartment divider between impellers, creating in effect two sub-compartments, similar to that which is described in my aforementioned application for Letters Patent. Each impeller for each sub-compartment is of two-piece construction including the gyratory element and a.v

separato-r element. The gyratory element is` driven by an eccentric and is arranged to interilt with a ilat blade separator which reciprocates in a machine slot in the top of the pumping com. partment. Movement of the flat blade separator. in its upward direction results from a suitable connection with the gyratory element. In the reverse or downward direction, the blade is moved by the use of a special crescent shaped' member which contacts the tops of both blades andoscillates in a slot provided in the pump housing. The impellers are arranged out-of-phase so that when one 'impeller blade moves upwardly it will rock the crescent shaped member and force` the other blade to travel downwardly with its corresponding gyratory element'.

As anv additional feature of the invention, and-v as a substitute for the impeller described above, I provide a non-resilient gyratory element contacting a, T shaped sliding separator which is simil-ar in some respects to that previously decribed, but which may be used to advantage in` specific cases of fluid pumping. In either case provision is made on the impeller for a complete shut-olic between the pumping compartment ports when the pump is on upper dead center, thus avoiding any tendency for back pressure during the interval between pumping cycles.

IA have further provided an improved style oi" ment of Figure l, taken on the lines 2 2 of Fig-- ure 1,

Figure 3 is a view similar to that of Figure 2, showing an alternative method of construction of the pump impeller of my invention, and

Figure 4 is a fragmentary section View through the shaft of my pump showing alternative bearing construction.

Referring to Figures 1 and 2, a hollow, substantially cylindrical pumping compartment member l@ forms the main pump body in the preferred embodiment of my invention, withinY which are located a pair of eccentrcs l2 suitably xed to shaft I3 and arranged 180 out-of-phase with each other. A header portion I on the top of member I0 provides for port openings and a footing I is added, integral with member I 0, so that the pump as a whole may rest on a suitable support. Impellers II of resilient non-metallic material are arranged with a sliding bearing t on eccentrics I2 so that they may gyrate within Vthe pumping compartment under the influence of eccentrics I2, and one pumping cycle takes place for each revolution of shaft I3.

As shown in Figure 2, shaft I3 is arranged to rotate counter-clockwise and the pumping cycle starts when impeller Il is on upper dead center, as shown in the broken lines in this View, with the fluid to be pumped disposed in the crescent shaped space therebelow between the impeller and the compartment. As impeller II is moved downwardly, during rotation of shaft I3, proceeding first to the left and then to the right as it contacts the compartment surface, pressure is effected on the contained fluid which is forced out from the pump through the discharge port 2l and discharge conduit 23 in the direction of the arrow. Vlhile uid is thus being ejected from the pump, a new supply is admitted through suction conduit 22 and suction port 20 on the left hand side of the impeller, to be discharged on the subsequent pumping cycle. This gyratory cycle of operation is well known in the art and need not be further elaborated upon here` A pair of end enclosing covers I4 and I5, Figure 1, are arranged to abut opposite sides of body portion ID and are suitably gaske'ted therewith, thereby forming the complete pumping compartment enclosure and further providing supports for shaft I3 which is trunnioned in anti-friction bearings I 6 therein. The right hand cover I5 closes off the shaft termination to prevent leakage of fluid from the pump which might otherwise seep through the clearance space between shaft I3 and bearing I6. The left hand cover I4, through which the shaft I3 projects for interconnection with a motor or other suitable driving means, is counter-bored for the insertion of a resilient gasket member I 1 which is held in place by means of a retaining washer I8 and a spring clip I9. With the spring clip in place, a certain amount of axial thrust is exerted by washer I8 against gasket I'I, squeezing the material of the gasket radially outwardly against the counterbore and radially inwardly against the shaft I3 to seal the pump against leakage along the shaft extension, yet permitting shaft rotation duringv pumping. The pumping compartment is divided into the two separate sub-compartments for the separate impellers II by means of the resilient divider 25 interposed between two metal plates 25 which tend to displace the material of member 25 radially outwardly against the inner surface of compartment Ii) and inwardly against shaft I3 when the pump is assembled, to thereby seal the sub-compartments from each other.

Referring again to Figure 2, for a detailed description of the impeller and parts accessory thereto, fiat metal blade separators 30 nt in a suitable arc-shaped groove 2l in the top surface portion of impellers I I intermediate of the raised portions 28 and, likewise, blades 33 are arranged ito reciprocate in slots 3| between pairs of antifriction inserts 32 held in place in the top of the pump by means of a supporting cap 33 and interconnecting machine screws 34. Suicient clearance is allowed between inserts 32 so that blades 39 may slide freely therebetween; however, this clearance is not excessive to the extent that Huid leakage will exist between the left hand and right hand ports 20 and 2l. Blades 33 therefore serve to bale intake from discharge and also to prevent impellers II from rotating with respect to the pumping compartment during operation of the pump.

A crescent shaped metal member 35, of the same thickness as blades 30, is disposed in the top of the pump between the inserts 32 and is guided in an arc-shaped groove in the cap 33. Member 35 contacts the top surfaces of blades 30 and interconnects the bladesso that, as one blade moves upwardly during operation of the pump, the other blade is forced down following itsrimpeller. Thus, there is `two way control of both blades, impellers II serving as the driving element upwardly and member 35 returning the blades downwardly, The fitting of parts is such that pressure contact exists at all times between the blade and its corresponding impeller so that a fluid-tight joint is maintained therebetween.

Raised portions 28 on impellers II serve as a stopper by projecting into the aperture in housing I0 formed at the port openings E9, 2l and thus sealing these suction and discharge ports from the pumping compartment as the impellers approach and leave upper dead center, avoiding back pressure which would otherwise occur at this part of the pumping cycle. By reason of the resilient deformable nature of the material of impeller I I portions 28 may be a very close fit in this aperture, in fact, the overall width may be slightly larger than the aperture to enhance the effectiveness of lthe seal at this location, and during the gyratory movement vthe raised portions 28 will be worked in and out of the aperture with more or less of a side-to-side movement. i

The impeller II of Figure 3 may be substituted for impeller I I of Figure 2 in instances where a substantially rigid, wear resistant material will serve the requirements, as for example where destructive solids like sand and grit are not present in the liquid to be pumped. It is to be noted here that impeller II, which may be metal or plastic, is fastened directly to shaft I3 as by keys 38 and rotates therewith to perform the pumping action. Blade 30', of 'I' cross-section, rides on impeller I I very much in the manner of a valve tappet on its cam, performing the function, as previously described, of baiiing the pump intake from the discharge. A difference in construction exists in that the blade 33 of this construction, in its extreme upward position, closes off the aperture between ports 2i) and ZI to prevent back pressure which would otherwise occur as the impeller passes upper dead center.

Alternative bearing construction for the pump shaft, according to Figure 4, may also be substituted for that shown in Figure l. Accordingly, a stub driving shaft I3 is arranged to extend outboard of the end closure I4 for interconnection with a source of power and to extend within the enclosure in bushing I3 to drive a second. shaft 40 through a suitable square pin and hole riving connection, locked in place with pin Shaft 40, on the left hand end, has an annular, tapered ring of extremely hard wear resistant material 4I cemented thereto which bears against a corresponding insert 42 in closure I4. On the right hand end of Shaft 4B a similar wear resistant tapered pin 43, cemented to the shaft, nts with insert 43 in closure I5'. Bearing adjustment is provided for by the set screw 45 in the closure I5. The wear resistant bearings are non-corrosive and during pump operation are lubricated take and discharge to reduce the efficiency the pumping apparatus.

with a supply of iiuid to be moved and likewise;

the discharge conduit Vis vconnected to the discharge line. If, instead Vof rthe vertically disposed' conduits, it is desirable to have horizontal intake or dischargefthe pipe plugs 24 and confI duits 22,723 may be interchanged according'fto the requirements.v i;

The pumping developed in the two sub-compartmentsis equalized by the communication existing therebetween on the intake and dis- 'zh'arge sides, but no back pressure is permitted 1by which communication will exist between iniof It will be understood that the invention is not limited to theparticular details shown by Way of illustration, but that many changes may be made'within the scope of the appended claims; I claim: 1.,In a lliquid pump of the class described, in combination, a cylindrical pumping compartment, a pump shaft extending axially therethrough and having an eccentric xed thereto, intake and discharge ports communicating with the pumping compartment at a parallel walled aperture terminating therein, a cylindrical inipeller fitted over said eccentric for gyration within said compartment, said impeller including a resilient, deformable, parallel sided extensin portion aligned with and corresponding in size to said aperture, whereby the aperture may be periodically sealed from the compartment during pumping, and a separator travelling with the impeller and forming a baiile between the intake and discharge ports.

2. In a liquid pump of the class described, inr

combination, a cylindrical pumping compartment, a pump shaft extending axially therethrough and having an eccentric fixed thereto, intake and discharge ports communicating with the pumping compartment at a walled aperture terminating therein, a cylindrical impeller tted over said eccentric for gyration within said compartment, said impeller including a resilient, deformable, parallel sided extension portion aligned With and larger than the terminating area of said aperture, whereby the aperture may be periodically sealed from the compartment thereby during pumping, and a separator travelling with the impeller and forming a baffle between the intake and discharge ports.

RALPH E. GORDINIER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 16,875 Griswold Mar. 24, 1857 711,092 Bates Oct. 14, 1902 1,408,380 Moors Feb. 28, 1922 1,408,381 Moors Feb. 28, 1922 1,523,785 Martin Jan. 20, 1925 1,827,088 Jaworowski Oct. 13, 1931 2,212,939 Irgens Aug. 27, 1940 2,237,075 Kemper Apr. 1, 1941 2,246,487 Fraser June 17, 1941 2,295,424 Picut Sept. 8, 1942 2,380,283 Van Ranst July 10, 1945 2,404,835 Freund July 30,1946 2,462,214 Namur Feb. 22, 1949 2,536,005 Knuth Dec. 26, 1950 FOREIGN PATENTS Number Country Date 673,564 France Oct. 8, 1929 

